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09192 Prediction of the Service Life of Nickel Based Alloys UNS N06625 and UNS N06059 and Superaustenitic Stainless Steel UNS S31266 in Seawater using in-House Crevice Corrosion Tests

Picture for 09192 Prediction of the Service Life of Nickel Based Alloys UNS N06625 and UNS N06059 and Superauste
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Product Number: 51300-09192-SG
ISBN: 09192 2009 CP
Author: Anne-Marie Grolleau, Valerie Debout and Herve Le Guyader
Publication Date: 2009
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The successful use of Ni-based alloys and highly-alloyed stainless in seawater applications depends on their ability to resist localized corrosion and in particular crevice corrosion. An extensive programme has been conducted by DCNS Cherbourg to optimise the use of such alloys for seawater pipings, identify their resistance to crevice corrosion and predict their performance under specific service conditions. This paper describes the in-house corrosion tests and methods used. The influence of several factors which are known to impact crevice corrosion initiation and propagation, such as crevice geometry, the nature of gaskets, temperature, the cleanliness of the surfaces and passivation treatments, are reviewed using these tests. The results of an evaluation campaign performed on Ni-based alloys A625 (UNS N06625), A59 (UNS N06059) and superaustenitic stainless steel B66 (UNS S31266) are presented.

Keywords: crevice corrosion, seawater, nickel based alloys, superaustenitic stainless steel
The successful use of Ni-based alloys and highly-alloyed stainless in seawater applications depends on their ability to resist localized corrosion and in particular crevice corrosion. An extensive programme has been conducted by DCNS Cherbourg to optimise the use of such alloys for seawater pipings, identify their resistance to crevice corrosion and predict their performance under specific service conditions. This paper describes the in-house corrosion tests and methods used. The influence of several factors which are known to impact crevice corrosion initiation and propagation, such as crevice geometry, the nature of gaskets, temperature, the cleanliness of the surfaces and passivation treatments, are reviewed using these tests. The results of an evaluation campaign performed on Ni-based alloys A625 (UNS N06625), A59 (UNS N06059) and superaustenitic stainless steel B66 (UNS S31266) are presented.

Keywords: crevice corrosion, seawater, nickel based alloys, superaustenitic stainless steel
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The study evaluated the effect of pH buffer on corrosion control of steel materials at elevated temperatures.  Laboratory results of pH buffer in sodium chloride, potassium chloride, sodium bromide and sodium chloride/sodium bromide brines,  Field case histories for buffered brine packer fluids in high-temperature, high-pressure wells.
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